Optimization Of Structural Parameters And Analysis Of Dynamic Characteristics Of Micro Machine Tool

With the technology development,more and more miniature parts were demanded in nowadays, and lots people pay close attention to micro machine tool due to its good size matching with workpiece, low energy consumption, save space, and easy to assemble and transport. The dynamic characteristic of the micro machine has an important influence to the precision and surface roughness. Therefore, dynamic analysis and structural optimization of the micro machine can improve the precision and cut down the surface roughness.Firstly, fluid dynamics analysis carried out on the air spindle obtained the bearing capacity and rigidity under different eccentricity,then static analysis of the air spindle was done, researched the deformation under different cutting force, found the spindle wear not caused by lack of rigidity. At last the dynamic analysis of the air spindle were carried out, and found that the spindle wear occurred in the third-order natural frequency.Secondly, the principle of equivalent stiffness was used to establish the finite element model of the micro machine. After the dynamic analysis, it was found that the airframe was the weak part of the machine. By using the transient powering method and the method of multipoint hammering and single point response, inherent frequency and the corresponding mode of vibration are educed. The theoretical results and actual test data are compared to verify the accuracy of the finite element model.Finally, without changing the weight of the airframe by using the structural design and optimization, improved the dynamics of the machine tool.